Thanks!

Wowwwww, beautiful

I will answer your two questions.

I don't know the number of Kanji, because they are countless.

Some Kanji has a meaning alone, but others don't.You have to connect more than two Kanji to make idioms.For example, "赤" means red and "不思議" means wonder.

Can I learn them all?

Are there too many kanji?
Do each kanji alone mean a word?